Either this half-sister is a slut or it's not the first time she's fucked her brother. Look how calmly she reacts to his appearance. And even though his dick isn't the healthiest, he's always around and she sucks it with pleasure. And judging from the video, the girl likes to be licked there. She even shudders when his tongue touches her clit. Yes, and with his fingers he helps her catch up before he comes inside her. It's nice to live with such an available sister!
Very confidently swallows a very large cock, why should we be surprised that she easily takes it in her other holes too! By the way, in her mouth she takes the cock deeper than in the front and in the anus! So I think a long dick isn't important to this woman, a small, decent thick one will do.
There are sex lovers.